Sushi rice vinegar is a type of Japanese vinegar that is specially designed to be used in the preparation of sushi. It is made from rice vinegar and sugar, and has a mild, slightly sweet flavour. Sushi rice vinegar is used to marinate the rice used in the preparation of sushi, giving it an ideal flavour and texture. It is also often used in the preparation of sushi sauces and dressings. Sushi rice vinegar can also be used in other Japanese dishes to add flavour and aroma.